Rational :

• war appeal : timely reference to commercial war (商戰 shangzhan) and war in general
• description of the qualities/effects : to grind various kinds of grains, to make flour  
• How to use it can use tradition methods (beats of burden), servant/human force or kerosene
• economic price
• saving energy and time
• convenience : can be installed in the house, become an ordinary domestic appliance
• authority/testimonial : used by most industrialists/professionals
• be aware of imitations, be sure to identify the right trademark, British trademark

Hyerbolic : superative (unrivalled, no better product)